Alloy.



. vided a metal possessing a minimum coefficlent of shrlnkage and expansion. Such an UNITED STATES PATENT OFFICE.

CHARLES VAN AMBURGH, OF TACOMA, WASHINGTON.

Patented Apr. s, 1919.

ALLOY.

1,300,058, Specification of Letters Patent. 110 Drawing. Application filed October 2, 1917. Serial No. 194,310.

To all whom it may concern Be it known that 1, CHARLES VAN AM- BURGH, a citizen of the United States of America, residing at Tacoma, in the county of Pierce and State of Washington, have invented certain new and useful Improvements in Alloys, of which the following is a specification.

This invention relates to certain new and useful improvements in alloy.

The primary object of the invention is the provision of a metallic alloy and the process of making the same whereby there 1s proalloy is. especially serviceable'in connection with devices having relatively movable parts subjected to excessive heat such as the pistons of explosive motors and engines.

A further object of the invention is the provision of a metal presenting excessive strength but at the same time being light in weight thereby especially adapting such metal for use in manufacturing aeroplane and other motors, the crank cases, cylinder blocks, and pistons being readily formed of this new alloy.

A still further object of the invention is the provision of an alloy that can be readily worked forforming desired objects and can be molded with a smooth finish, the allo having great resistance and strength as we 1 as ductility and lightness.

My alloy consists of the following com-- ponent parts :aluminun 1 bronze 16%, copper 1%, silicon copper 3% and pure aluminum 80%.

The aluminum bronze herein designated is formed of copper 815%, aluminum 89% and tin 2.4% while the silicon copper is formed of 90% copperand 10% silicon.

In the process of manufacture, the aluminum bronze and silicon copper are separately formed by melting en masse the respective elements thereof. Th 16% of aluminum bronze and the 1% of copper are then melted together and when in a molten state, the 3% of silicon copper is added to the batch which becomes eltedthereby and enters into the constituency of the product.

The 80% of pure aluminum is then pro vided in ingot form and is added to the batch which is in a molten state within a suitable crucible, such addition of the aluminum taking place by suspending the ingot state, the batch being stirred or agitated during the addition of the aluminum. This completes the forming of the alloy and may be cooled ingot or any other convenient form for use.

The percentages of the metal ingredients herein noted have been found satisfactory in tests for fulfilling the objects of my invention butthe same are submitted by Way of example of the preferred embodiment of the formulae f0 rthe alloy. It will be under stood however that slightly different percentages may beused without departing from the spirit and scope of my invention as claimed.

WVhat I claim as new is:

'1. An alloy consisting of a predominating proportion of aluminum, with substantial but smaller proportions of copper, tin and silicon.

ing ofv melting together aluminum bronze and copper, adding silicon copper and melting the same in the batch and adding aluminum;

6. The process of making an alloy consisting in first meltin aluminum bronze and copper, adding an melting silicon copper therein and adding pure aluminum by melting aluminum in suspension over the batch and stirring the molten batch during the addition of aluminum f 7. A process for forming an alloy consisting in melting copper, aluminum and tin and when in a molten state adding copper and silicon co per thereto and adding pure aluminum to t e molten mass by suspending aluminum and melting the same above the mass while maintaining the temperature of the batch sufficiently high for maintaining the metal in a molten state and stirring the batch during the adding of the aluminum.

8. A process of making an alloy consisting 90% and silicon 10%; adding 3% of said in forming aluminum bronze by melting tosilicon copper to the molten batch and addgether 8.6% of copper, 89% aluminum and ing 80% of pure aluminum to complete the 2.4% of tin; melting for the batch 1% of batch. 10 copper with 16% of the said aluminum In testimony whereof I aflix my signature. bronze; forming silicon copper of copper CHARLES VAN AMBURGH. 

